Electric water heater



y 1 s. D. ROBERSON ET AL 1,968,708

ELEGTHI G WATER HEATER Filed March 15. 1933 PAi/i o Mf/a ATTORNEY Patented July 31, 1934 UNITED STATES PATENT QFFHQE ELECTRIC WATER HEATER Application March 15, 1933, Serial No. 660,902

1 Claim.

This invention relates to electric water heaters and has for the primary object, the provision of a device of the above stated character which may be employed wherever it is desired to heat water and will quickly and economically heat the water and is so constructed that the circuit between the electrodes will be completed by the water and the latter rapidly heated by absorbing the heat between the electrodes.

With these and other objects in view this in vention consists in certain novel features of con struction, combination and arrangement of parts to be hereinafter more fully described and claimed.

For a complete understanding of my invention, reference is to be had to the following description and accompanying drawing, in which Figure 1 is a vertical sectional view illustrating an electric water heater constructed in accordance with my invention.

Figure 2 is an end View illustrating the heating unit.

Figure 3 is a sectional view taken on the line 3-3 of Figure 1.

Figure 4 is a detail view illustrating an insulator.

Figure 5 is a sectional view taken on the line 55 of Figure 4.

Figure 6 is a view similar to Figure 4 illustrating another insulator.

igure 7 is a sectional View taken on the line 7-7 of Figure 6.

Figure 8 is a detail sectional view illustrating a conductor terminal.

Figure 9 is a detail sectional view illustrating the means for securing the conductor terminal in one of the insulators and to one of the electrodes.

Referring in detail to the drawing, the numeral 1 indicates a casing or shell having an outlet 2 and an inlet 3 to which control pipes of a system may be threaded. The casing 1 includes sections detachably connected by screw threads and equipped with a gasket 4 therebetween. The sections of the casing being detachable from each other permit the heating unit 5 to be readily assembled within the casing.

The heating unit 5 consists of inner and outer relatively spaced electrodes 6 and 7 preferably in the form of cylindrical sleeves supported at their ends by insulating spiders 8 detachably connected by a bolt 10 which extends centrally through the inner electrode 6.

Insulators 11 and 12 abut each other and the insulator 12 is equipped with sleeves 13 extending through an opening in the wall of the casing. The insulator 11 is provided with an opening alining with one of the sleeves of the insulator 12 and is provided with a sleeve 14 extending through an opening in the outer electrode and abutting the inner electrode, as shown in Figure 1. Exteriorly threaded sleeves 15 are suitably secured to the ends of electrical conductors l6 and extend into the sleeves of the insulators and have threaded thereto headed anchoring sleeves 1'7, the heads of which abut the walls of the electrodes. The sleeves 15 project outwardly of the casing 1 and have threaded thereon loci: nuts. Thus it will be seen that the electrodes are effectively supported within the casing and insulated from the latter and from each other so that when the conductors 16 are charged with electricity, the water in the casing will complete the circuit between the eletcrodes and the latter becoming charged with electricity will heat the water economically.

While this invention is shown primarily for heating water it is to be understood that the device may be conveniently employed for heating other fluids or the electrodes and their support may be placed in cooking utensils, radiators or any other device desired to be heated.

While we have shown and described the preferred embodiment of our invention, it will be understood that minor changes in construction, combination and arrangement of parts may be made without departing from the spirit and scope of our invention, as claimed.

Having described the invention, we clairn:

An electric water heater comprising a casing, inner and outer cylindrical electrodes in the casing, spiders engaging the ends or" the electrodes, means adjustably and detachably connecting the spiders, an insulator carried by the casing and having openings, a second insulator abutting the first insulator and having a cylindrical portion extending through the outer electrode and abutting the inner electrode, exteriorly threaded sleeves having electrical conductors secured therein mounted in the insulators, securing sleeves threaded to the first-named sleeves and having headed ends abutting the electrodes, and nuts turned on the first-named sleeves against the casing.

S. DENVER ROBERSON. PHILIP W. HARMON. 

